Robin Thomas (born February 12, 1949) is an American film, television and theater actor, and sculptor. He changed his professional name to his birth name Robin Thomas Grossman in 2014 but returned to "Robin Thomas" in 2015.Thomas' best-known television roles are as Mark Singleton in Another World (1983–85), and as Geoffrey Wells on Who's the Boss?. He had recurring roles in series such as Murphy Brown, Matlock, Life Unexpected, and The Division.